An output member for a Direct Impact Hopkinson pressure bar includes an elongate tube portion and a disc-shaped cap portion. The tube portion has a first end and an opposite second end, while the cap portion includes a first face and an opposite second face. A circular stub protrudes from a center of the first face, and a circular cavity is formed in the second face. Each of the stub and the cavity is concentric with the cap portion, with a diameter of the cavity being greater than a diameter of the stub. The second face of the cap portion is positioned in intimate contact with the first end of the tube portion, with the cap portion being concentric with the tube portion.

A clamp and a shear test device are provided, and relate to the technical field of rock mass mechanics tests. The clamp comprises a box body, wherein an opening is formed in one side of the box body, two clamping structures are oppositely arranged in the box body, a sample is arranged between the two clamping structures, each clamping structure comprises an adjusting mechanism, and a distance between the two clamping structures is adjusted through adjusting mechanisms of the two clamping structures. According to the clamp, real-time dynamic adjustment is conveniently and rapidly achieved, the stability of sample clamping is ensured, and therefore the requirement that the shear load can be truly and effectively transmitted to the sample through the box body is met.

In some embodiments, a shaft testing device comprises a support comprising a non-contact bearing. The support is arranged to support a workpiece such as a shaft. A loading mechanism comprises a non-contact bearing. The loading mechanism is arranged to apply a load to the shaft. In some embodiments, the load is applied orthogonal to a longitudinal axis of the shaft. In some embodiments, a non-contact bearing comprises an air bearing.

A material testing system that uses at least one hydraulic grip is improved with cable clips that are attachable to a respective lateral side of each hydraulic grip wedge. Each cable clip has another end that extends to engage a cable(s) extending from a corresponding wedge retention spring hole. The cable(s) enable manual extension of a wedge retention spring for engagement and disengagement from the hydraulic grip wedge. The cable clip maintains the cable in a noninterfering position during operational use of the material testing system.

A material testing system that uses at least one hydraulic grip is improved with cable clips that are attachable to a respective lateral side of each hydraulic grip wedge. Each cable clip has another end that extends to engage a cable(s) extending from a corresponding wedge retention spring hole. The cable(s) enable manual extension of a wedge retention spring for engagement and disengagement from the hydraulic grip wedge. The cable clip maintains the cable in a noninterfering position during operational use of the material testing system.

A testing machine includes a base, at least a pair of columns joined to the base and a crosshead joined to the columns at a location spaced apart from the base. At least a pair of specimen holders are provided. A first specimen holder is supported by the crosshead and faces the base, and a second specimen holder is supported by the base, the base being that portion joined to each of the columns closest to the crosshead. An actuator connected in series between one of the specimen holders and the corresponding base or crosshead. A brace connected to each of the columns and spanning between the columns, the brace being connected to each of the columns at a location along a length thereof between the base and the crosshead.

In some embodiments, a shaft testing device comprises a support comprising a non-contact bearing. The support is arranged to support a workpiece such as a shaft. A loading mechanism comprises a non-contact bearing. The loading mechanism is arranged to apply a load to the shaft. In some embodiments, the load is applied orthogonal to a longitudinal axis of the shaft. In some embodiments, a non-contact bearing comprises an air bearing.

Provided are a material in-situ test device and method under multi-load and multi-physical field coupled service conditions. The device is composed of a precise six-degree-of-freedom composite load applying module, a precise torsion module, a precise indentation module, a clamp module and a control module which work together to complete a composite-load and multi-physical field coupled experiment, and is integrated with a digital speckle strain measurement and infrared thermal imaging module and a microscope observation module, so as to carry out in-situ observation and quantitative characterization on material deformation behaviors and damage mechanism phenomena in a composite-load and multi-physical field loading process. For example, loading methods of cantilever type pure bending, cantilever type tension/compression-torsion, and cantilever type bending-torsion, etc. can realize the loading of composite load. Silicon nitride ceramic heating sheets, Peltier tiles and current loading are used for achieving simulation of multiple physical fields such as cold/hot-electricity fields.

Provided are a material in-situ test device and method under multi-load and multi-physical field coupled service conditions. The device is composed of a precise six-degree-of-freedom composite load applying module, a precise torsion module, a precise indentation module, a clamp module and a control module which work together to complete a composite-load and multi-physical field coupled experiment, and is integrated with a digital speckle strain measurement and infrared thermal imaging module and a microscope observation module, so as to carry out in-situ observation and quantitative characterization on material deformation behaviours and damage mechanism phenomena in a composite-load and multi-physical field loading process. For example, loading methods of cantilever type pure bending, cantilever type tension/compression-torsion, and cantilever type bending-torsion, etc. can realize the loading of composite load. Silicon nitride ceramic heating sheets, Peltier tiles and current loading are used for achieving simulation of multiple physical fields such as cold/hot-electricity fields.

A material testing system that uses at least one hydraulic grip is improved with cable clips that are attachable to a respective lateral side of each hydraulic grip wedge. Each cable clip has another end that extends to engage a cable(s) extending from a corresponding wedge retention spring hole. The cable(s) enable manual extension of a wedge retention spring for engagement and disengagement from the hydraulic grip wedge. The cable clip maintains the cable in a noninterfering position during operational use of the material testing system.